[Bug] Built files are es6 modules, but the project is not marked as type: module

[IanVS]

Describe the bug

I was attempting to reproduce a bug using npx sb@next repro, and added jest, @storybook/testing-library, @storybook/testing-react, etc, and am now getting jest errors because of this package:

 Jest encountered an unexpected token

    ...

    Details:

    /Users/ianvs/code/experiments/issue-16677/node_modules/@storybook/testing-library/dist/index.js:16
    import { once } from '@storybook/client-logger';
    ^^^^^^

    SyntaxError: Cannot use import statement outside a module

      1 | import React from 'react';
      2 | import { ComponentStory, ComponentMeta } from '@storybook/react';
    > 3 | import {userEvent, screen} from '@storybook/testing-library';
        | ^
      4 |
      5 | import { Button } from './Button';
      6 |

Steps to reproduce the behavior

IanVS/storybook-issue-16677@8549685

yarn then yarn test

Environment

• OS: macOS
• Node.js version: v16.4.0

Additional context

I believe this is because the tsconfig for this project specifies es6 modules as the target output, but module is not specified in the package.json, cjs files aren't also built, and the package.json does not list "type": "module".

[github-actions]

🚀 Issue was released in v0.0.9 🚀